LR38603 データシートの表示（PDF） - Sharp Electronics

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LR38603

Digital Signal Processor for Color CCD Cameras

Sharp Electronics 

Electronic exposure control data =

[{Weighted data 1 q x (64 – CW_E (address 13h))

+ Weighted data 2 w x CW_E}/64

x (256 – P_HEE (address 17h) – P_LEE (address 18h))

+ Top level e x P_HEE + Bottom level r x

P_LEE]/256

Y11 Y12 Y13 Y14 Y15 Y16 Y17 Y18

Y21 Y22 Y23 Y24 Y25 Y26 Y27 Y28

Y31 Y32 Y33 Y34 Y35 Y36 Y37 Y38

Y41 Y42 Y43 Y44 Y45 Y46 Y47 Y48

Y51 Y52 Y53 Y54 Y55 Y56 Y57 Y58

Y61 Y62 Y63 Y64 Y65 Y66 Y67 Y68

Y71 Y72 Y73 Y74 Y75 Y76 Y77 Y78

Y81 Y82 Y83 Y84 Y85 Y86 Y87 Y88

q Weighted data 1

This comes from the following equation weighting in

horizontal.

Weighting factors are the data from UW_E1

(address 0Bh) to UW_E8 (address 12h).

Weighted data 1 =

{(Y11 + Y12 + π + Y18)/8 x UW_E1 (address 0Bh)

+ (Y21 + Y22 + π + Y28)/8 x UW_E2 (address 0Ch)

:

+ (Y81 + Y82 + π + Y88)/8 x UW_E8 (address

12h)}/256

The sum from UW_E1 to UW_E8 shall be 256.

w Weighted data 2

Weighting area can be set by the data of CWP_E

(address 14h), CWA_E (address 15h).

Weighting position can be set by the data of

CWP_E.

Weighting area size can be set by the data of

CWA_E.

Weighted data come from averaged data in chosen

area.

LR38603

e Top level : The highest luminance data in one

image by averaging either 4 pixels

or 8 pixels in horizontal.

r Bottom level : The lowest luminance data in

one image by averaging either 4

pixels or 8 pixels in horizontal.

Auto White Balance Control

If white balance control data are less than the data

of AWB_IW_S and AWB_QW_S (address 40h),

then AWB stops.

If white balance control data are less than the data

of AWB_IW_L (address 3Eh) and AWB_QW_L

(address 3Fh) AWB is made active so that white

balance control data are less than the data of

AWB_IW_S and AWB_QW_S.

When the data are greater than AWB_IW_L and

AWB_QW_L, AWB will be active again.

White balance data come from the following

equation using averaged I and Q data of 16 areas

in one image.

I11

I12

I13

I14

I21

I22

I23

I24

I31

I32

I33

I34

I41

I42

I43

I44

Q11

Q12

Q13

Q14

Q21

Q22

Q23

Q24

Q31

Q32

Q33

Q34

Q41

Q42

Q43

Q44

White balance data =

{Weighted data 3 q x (64 – CW_IQ (address 33h))

+ weighted data 4 w x CW_IQ}/64

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